I bought 4 by 10 foot sheets to fit center of cross members which were 48 " center to center then cut to fit width of trailer. more joints than original but worked. look on internet for alum supplier in your area or local fabrication shop. hope this helps. i has a 31 foot, built new frame and in process rebuild.

Hi, Did Airpartsinc have the 61.5" wide material? I called them and they did not. I am looking for the same.

They only have 4' wide but can give you rolled to length desired You'll be hard presssed to find wider that you can get your hands on. Best bet is to find 4'x8' or 4'x10' sheets locally and cut them. 4'x10' is more waste, the distance between the frame rails requires a little over 5' across so you're just wasting the rest unless you have another use. You'll want to cut them so they go from cross member to cross member plus a little.
If the supplier has a large sheet metal shear, make a plan and have them shear it for you, if they dont charge a fortune. I've seen extremes in prices for shearing. My local one is pretty reasonable($25+$2 per cut), one I asked in NJ was ricldiculous($3 per linear foot).
Start at the back and work forward so the seams face backwards so they aren't facing forward which would cause a scoop effect for road spray.

I am in the process of replacing my belly pan. I ordered 4' Wide material from Airparts. She told me how to cut it for a good edge- score a few times with a sharp utility knife, then bend until it breaks. The floor joists are 24" on center so this will be fine using 48" material. I attached 1" aluminum angle to each floor joist to make it easier to install the rivets blindly, well easier in theory. We'll see how well it works.

I want to provide a strong recommendation for AirPartsInc. I ordered the belly pan material and it arrived in a nice box (to be used to help you cut it and then store the balance) in 3 days.

The photo below shows the 1" aluminum angle that I attached to each floor joist to make installation of the rivets easier.Attachment 289823

Hi Dan, looks like your doing a fantastic job. It looks like you are insulating the heck out of your subfloor area.
Questions:
Is the pink material 1"'closed cell foam insulation? And is the yellow material batt insulation?

Please explain the process of the 1" aluminum angle strips for attaching the sheet aluminum. Are you riveting them to the joists and then riveting the belly sheets to them? Not sure I get it, I'm obviously missing something.

Also, are you able to do all of this with out removing the axles? I haven't really studied mine but it looks like I'm going to be removing, propane lines, etc. Not sure about the axles.

Once everything is exposed, what do you think my chances are of being able to upgrade my tank monitoring system to the Garnet SeeLevel system ? Maybe, using my existing wiring. Just wondering if you've already looked into this.

Are you beading your sheet aluminum?

Please post additional progress pictures if you can when you get there.

If you look at post #114 of my thread (Dan's 66 Tradewind Improvements) you will find my method of installing the belly pan by yourself. Other posts also provide details of the belly pan work I completed.

If you look at post #114 of my thread (Dan's 66 Tradewind Improvements) you will find my method of installing the belly pan by yourself. Other posts also provide details of the belly pan work I completed.